Implement textureProjLod and textureProjLodOffset.

BUG=angle:564

Change-Id: I547c69908d0aa1809f844a50230bc019e6dd5893
Reviewed-on: https://chromium-review.googlesource.com/186685
Tested-by: Nicolas Capens <nicolascapens@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
2 files changed